Does any one have a list of good Joker and Harley Quinn comics?

I’ve been watching Batman: The Animated Series for a while now and I love the characters of Harley Quinn and The Joker. I just find their twisted relationship fascinating.

I already have Batman: Mad Love and other Stories by Bruce Timm and Paul Dini and would like other books similar to this.

The comics I’m interested in are the 90’s ones so if anyone has a list of those it would be greatly appreciated. Thanks!